At 25°C, an aqueous solution containing 35.0 wt% H₂SO₄ has a specific gravity of 1.2563. A quantity of the 35% solution is needed that contains 195.5 kg of H₂SO₄. 

(a) Calculate the required volume (L) of the solution using the given specific gravity. 

(b) Estimate the percentage error that would have resulted if pure-component specific gravities of H₂SO₄ (SG = 1.8255) and water had been used for the calculation instead of the given specific gravity of the mixture.